Breast nodules 12mmx9mm are more serious and patients need to be seen in breast surgery to improve the relevant examination and treatment. Breast nodules are mostly cystic masses produced after breast enlargement, benign lesions are the majority of cases, commonly found in women of childbearing age, and can be found accidentally during physical examinations. In some cases, breast nodules may resolve or disappear on their own with age and do not require treatment, but regular checkups are needed to observe the changes. Breast nodules of 12mmx9mm, with a large nodule size, require ultrasound or mammography to determine the possibility of malignant lesions. Benign lesions need to be treated by medication, adjustment of poor lifestyle habits, dietary management, etc., and if the results are not good, surgical removal is required if necessary. When this occurs, patients should pay attention to it, regularly observe changes in their condition, maintain a regular life, and avoid excessive stress. For patients who take surgical treatment, regular follow-ups are also required.